<html>
    <head>
        <link rel="stylesheet" type="text/css" href="https://ajax.aspnetcdn.com/ajax/jquery.ui/1.10.3/themes/ui-lightness/jquery-ui.css">
        <script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.11.2.min.js"></script>
        <script src="https://ajax.aspnetcdn.com/ajax/jquery.ui/1.11.2/jquery-ui.min.js"></script>
    </head>
    <body>
     <p><a>Hello</a></p>
     <script type="text/javascript">
     $(function(){
        $('a').button().click(function(){alert('Hello jQuery UI');});
     });
     </script>
    </body>
</html>